Method of making shafts, connecting rods, and the like



Dec. 4, 1928.

' F. FAUDE METHOD OF MAKING SHAFTS, commune RODS, AND THE LIKE Orizinal Filed March 10. 1924 2 Sheets-Sheet -1 Dec. 4, 1928.

F. FAUDl METHOD OF MAKING SHAFTS, CONNECTING RODS, AND THE LIKE 2 'SheetS-She et 2 Original Filed March 10, 1924 rmlz" rials gwwntoc Patented Dec. '4, 192a.

UNITED STATES PATENT 1,693,838 OFFICE.

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original application filed March 10, 1924, Serial No. 698,054, and in Germany July 4/1922. Divided and V this application filed November My invention relates to an improved method of making joints for shafts, connecting rods, and'the like, as the j oints, for example,

described and claimed in my copending applieation filed March 10, 1924, Serial Number. 698,054, of which application this is a division. a

' The object of my invention is to provide a method of forming joints'which will be durable and willreadily withstand the blows and vibrations of rough usage, without loosening or becoming disabled.

With this aim in view, my inv'entionconsists in providing the tubular member with an end slightly, more or less, smaller in diameter than the companion member to be received is in exterior diameter, and then heating the tubular member and Tfitting it .over the inner member whereby the two. members 7 will be held together by internal tension, the

contacting surfaces of the two members being interlocked by their superficial formation.-

Further, the invention resides in the'novel steps and arrangement of steps hereinafterhwhi h th ti 8 can dil b in ert d described and claimed, reference being made to the accompanying drawings, wherein 1 Figure 1 is an elevation partly in' section showing a joint formed by my improved method; i i

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1; Figs. 3 and'4 are elevations of modified forms of joints formed by the improved method;

Fig. 5 is a sectional view depicting a Cardan shaft having solid sha'ftosections secured ice , to its ends;

,Fig. 6 is an elevation partly 111" section showmg a part of a pipe having a fiangese cured to its end;

Fig. 7.is a cross section on hne 77 of Fig. 6;

showing various methods of mounting the n the axle of the front wheels of an springs o automobile.

Referring more in detail tothe accomdrawings, the numeral 9 designates an inner member and 12 the outer memshrinks, when cooling, lishes the desired firm interlock between the '8 is an elevation showing the-axis of means of the solid cylindrical portions :1, 1925. Serial No. cases.

her, the latter being tubular and'havin .its inner diameter slightly smaller, at least, t an the outer diameter of the inner member 1, whereby the former will require expansion over the part of inner member on which it fits. This form of joint is exemplified in Figs. 1 and 2, wherein the tubular member 12 is heated to expand the same for receiving the inner member 9, or the cylindrical extension 8 thereof. The cooling of. the tubular mem- 5 her, therefore, causes the same to shrink and tightly embrace the cylindrical portion 8 of and form square or rectangular projections onto which the heated tubular member 12 and thereby estabtwo members. In making the joint, the tubular member is heated to a dark red heat after thereinto without the application of high pressure, and when the "outer member is cooled the same will have forced itself into the circumferential and longitudinal grooves 10 and 11. To accentuate this interlock, a strong ring, made in sections, and having a length equal to the portion 8, is placed about the outer member when hot and compressed. Theinner member 9 is also provided with an axial flan e.13.for confining the adjacent end of the tu ular member, said end having 90 a flare, as indicated at 14. It is alsoto be noted that the circumferential grooves10 are completely interrupted by the deeper longitudinal grooves 11.

In Fig. 3, the cylindrical portion is formed with longitudinal grooves 15 into which the material of thetubular member is forced to form the desired interlock ofthe joint.

Fig. 4 depicts a connecting rod form ng- 4 part of the steering mechanism of a motor 10 vehicle, the rod consisting-oi 'a pipe 18 having spherical joints 19 secured theretirzby the periphery of which are formed the circumferential grooves 16 for providing the. interlock, with the tubular member 18. In this form is the heating and shrinkage method of connecting the inner, and outer members also utilized. The pipeg'provides' a light rod and the joint is a firm one which will w1th 1 stand the jars and vibrations incident to vehicular trafiio. 4

Fig. 5 discloses the method in joining the several parts of a Garden shaft of a motor vehicle, in which the tubular shaft 24 is secured at one end to the solid shaft section of the Cardan joint, the solid cylindrical portion 22 of said shaft section being formedwith 1on gitudinal grooves 23 and the flange 25 embracing the adjacent end of the tubular mem ber 24. The bevel gear 21 is secured to one end of shaft section 20, the opposite end be-,

pering end 26' of the pipe or shaft 24 to provide a flush joint.

Another embodiment pf the joint made by improved method is exemplified in Figs. 6 and 7-, wherein the flange has an integral portion of tubular formation, as indicated atthe sleeve 30. The

30, the pipefitting in eripheral grooves 28 pipe 27 is formed with i and 29, running circum erentially and longitudinallythereof for being ressed into the tubular portion 30, as by a all or mandrel, to obtain the interlocking joint. In a similar manner a second pipe or a sleeve may be se' cured to the pipe 27.

Figs. 8 and 9 depict a tubular front axle 31 having a part 32 of the steering knuckle secured to each end by the foregoing type of joint, the cross section of the axle being reduced rearwardly in order to reduce the resistanceof the air. The tubular ends are increased in thickness and thereby provide a stronger joint about the cylindrical portion 33 of the knuckle parts 32. The springs 40 are secured to the axle by means of clamping plates 34 and the spring-embracing U-bolts 35. The axle 31 is preferably flattened, as in Figs. 13 through 16, to form broad seats for revent them from about on the ax e which tendency the I turmng they would have if the axle was truly circular.

plates 34 and 34' to 1,ees,sas

In Figs. 10 and 11, the wall of the tubular shaft is pressed inwardly to form the seat for the upper clamping plate 34, while in Figs. 12 and 13 the wall of the axle is 'pressedoutwardly at its top,"as at 37.

\Vhile I have described the several steps of my method in detail, Iwish it understood that I do not'intend'to be limited thereby except as the scope of the appended claims and the prior art may require, for obviously different joints may be formed in specific ways slightly different from each other and still the desideratum obtained. 1

What is claimed is 1. The method of jointing a tubular outer member to aninner member, which consists in forming an inner member with asurface having depressions andaflange overhanging and forming a groove beyond one of the margins of said depressions, heating the outer memb r so as to expand and soften it, passing thabmter member over said surface of the inner ember and fitting one of its ends beneath said 'fiange'and into'said groove, and

in forming the inner member with axial and circumferential depressions and of a crosssection slightly larger than the inner crosssection of the outer member, heating the tubular member to soften it and axially forcing the samewith a press fit on the inner member,

and applying pressure to and circumferentially a out the outer member to force pertions of its inner periphery only into the said depressions of the inner'member while simultaneously allowing said outer member to cool and shrink upon theinner member, and so as to leave the outer surface of said outer member devoid of indentures.

In testimony whereof I afiix my signature.

FRITZ FAUDI. 

